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<h1>所有的异常处理演示示例</h1>
<h3><a href="daodb">处理Dao中数据库异常</a> </h3>
<h3><a href="daomy">处理Dao中自定义异常</a> </h3>
<h3><a href="daono">处理Dao中未知异常</a> </h3>
<hr/>
<h3><a href="servicedb">处理Service中数据库异常</a> </h3>
<h3><a href="servicemy">处理Service中自定义异常</a> </h3>
<h3><a href="serviceno">处理Service中未知异常</a> </h3>
<hr/>
<h3><a href="db">处理Controller中数据库异常</a> </h3>
<h3><a href="my">处理Controller中自定义异常</a> </h3>
<h3><a href="no">处理Controller中未知异常</a> </h3>
<hr/>
<h3><a href="404">404错误</a></h3>
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